Abstract
A study of the infrared and Raman spectra of previously synthesized phthalimide-<sup>15</sup>N-H and phthalimide-<sup>15</sup>N-D has been carried out. With the new data obtained, the vibrational spectra of the phthalimide molecule in a <i>C</i><sub>2<i>v</i></sub>* symmetry has been reassigned, but taking into account that the molecule in the solid state forms dimers bonded by intermolecular hydrogen bonds; these dimers have a <i>C</i><sub><i>i</i></sub> symmetry. On the other hand, a semi-empiric calculation of the force fields of this molecule has been carried out by the MINDO/3-FORCE method, which required a prior optimization of the molecular geometry; the force field was transformed to the space of internal coordinates.
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